upgrade gradle version

app/android/app/build.gradle

@@ -8,7 +8,7 @@ if (localPropertiesFile.exists()) {
 
 def flutterRoot = localProperties.getProperty('flutter.sdk')
 if (flutterRoot == null) {
-    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
+    throw new FileNotFoundException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
 }
 
 def flutterVersionCode = localProperties.getProperty('flutter.versionCode')

app/android/build.gradle

@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:3.6.3'
     }
 }
 

app/android/gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.2-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip

app/pubspec.lock

@@ -98,7 +98,7 @@ packages:
       name: file_picker
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.6"
+    version: "3.0.0-nullsafety.2"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -110,42 +110,42 @@ packages:
       name: flutter_colorpicker
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.3.5"
+    version: "0.4.0-nullsafety.0"
   flutter_keyboard_visibility:
     dependency: transitive
     description:
       name: flutter_keyboard_visibility
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "4.0.4"
+    version: "5.0.0-nullsafety.3"
   flutter_keyboard_visibility_platform_interface:
     dependency: transitive
     description:
       name: flutter_keyboard_visibility_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.1"
+    version: "2.0.0-nullsafety.0"
   flutter_keyboard_visibility_web:
     dependency: transitive
     description:
       name: flutter_keyboard_visibility_web
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.1"
+    version: "2.0.0-nullsafety.0"
   flutter_plugin_android_lifecycle:
     dependency: transitive
     description:
       name: flutter_plugin_android_lifecycle
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.11"
+    version: "2.0.0"
   flutter_quill:
     dependency: "direct main"
     description:
       path: ".."
       relative: true
     source: path
-    version: "0.3.3"
+    version: "1.0.0"
   flutter_test:
     dependency: "direct dev"
     description: flutter
@@ -169,28 +169,28 @@ packages:
       name: http
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.12.2"
+    version: "0.13.0"
   http_parser:
     dependency: transitive
     description:
       name: http_parser
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.1.4"
+    version: "4.0.0"
   image_picker:
     dependency: transitive
     description:
       name: image_picker
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.6.7+22"
+    version: "0.7.2"
   image_picker_platform_interface:
     dependency: transitive
     description:
       name: image_picker_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.1.1"
+    version: "2.0.0"
   js:
     dependency: transitive
     description:
@@ -260,7 +260,7 @@ packages:
       name: pedantic
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.9.2"
+    version: "1.11.0"
   photo_view:
     dependency: transitive
     description:
@@ -281,7 +281,7 @@ packages:
       name: plugin_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.3"
+    version: "1.1.0-nullsafety.2"
   process:
     dependency: transitive
     description:
@@ -289,20 +289,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "4.1.0"
-  quill_delta:
-    dependency: transitive
-    description:
-      name: quill_delta
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.0.0"
   quiver:
     dependency: transitive
     description:
       name: quiver
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.5"
+    version: "3.0.0"
   quiver_hashcode:
     dependency: transitive
     description:
@@ -321,7 +314,7 @@ packages:
       name: source_span
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.8.1"
+    version: "1.8.0"
   stack_trace:
     dependency: transitive
     description:
@@ -349,7 +342,7 @@ packages:
       name: string_validator
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.4"
+    version: "0.2.0-nullsafety.0"
   term_glyph:
     dependency: transitive
     description:
@@ -370,7 +363,7 @@ packages:
       name: tuple
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.3"
+    version: "2.0.0-nullsafety.0"
   typed_data:
     dependency: transitive
     description:
@@ -398,42 +391,42 @@ packages:
       name: url_launcher
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "5.7.10"
+    version: "6.0.2"
   url_launcher_linux:
     dependency: transitive
     description:
       name: url_launcher_linux
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.0.1+4"
+    version: "2.0.0"
   url_launcher_macos:
     dependency: transitive
     description:
       name: url_launcher_macos
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.0.1+9"
+    version: "2.0.0"
   url_launcher_platform_interface:
     dependency: transitive
     description:
       name: url_launcher_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.9"
+    version: "2.0.1"
   url_launcher_web:
     dependency: transitive
     description:
       name: url_launcher_web
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.5+1"
+    version: "2.0.0"
   url_launcher_windows:
     dependency: transitive
     description:
       name: url_launcher_windows
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.0.1+3"
+    version: "2.0.0"
   vector_math:
     dependency: transitive
     description:
@@ -463,5 +456,5 @@ packages:
     source: hosted
     version: "0.1.2"
 sdks:
-  dart: ">=2.12.0-0.0 <3.0.0"
+  dart: ">=2.12.0-259.9.beta <3.0.0"
-  flutter: ">=1.22.0"
+  flutter: ">=1.24.0-10.2.pre"

pubspec.yaml

@@ -20,7 +20,7 @@ dependencies:
   image_picker: ^0.7.0
   photo_view: ^0.10.3
   universal_html: ^1.2.4
-  file_picker: ^3.0.0-nullsafety.2
+  file_picker: ^3.0.0-nullsafety.4
   string_validator: ^0.2.0-nullsafety.0
   flutter_keyboard_visibility: ^5.0.0-nullsafety.2